In my opinion both of them are good enough (IMG:style_emoticons/default/smile.gif) but if you ask me, i will go with sony xperia arc. Reasons : Sony Experia arc s is cheaper than nokia 800. With the ceaper price you can get many better features than lumia 800 , like memory card slot(which nokia lumia has not) , 480 x 854 pixels, 4.2 inch(nokia lumia 480 x 800 pixels, 3.7 inches) and many more (IMG:style_emoticons/default/smile.gif)

Just added a little opinion from me..if you wanna try some new flavors of this phone OS then try go with Nokia lumia 800 (IMG:style_emoticons/default/wink.gif) many people said this phone has better experience in internet browsing, and there are many updates for this Phone OS(Nokia Lumia 800 using Windows Phone System Operation) too (IMG:style_emoticons/default/thumbsup.gif)

In my opinion both of them are good enough (IMG:style_emoticons/default/smile.gif) but if you ask me, i will go with sony xperia arc. Reasons : Sony Experia arc s is cheaper than nokia 800. With the ceaper price you can get many better features than lumia 800 , like memory card slot(which nokia lumia has not) , 480 x 854 pixels, 4.2 inch(nokia lumia 480 x 800 pixels, 3.7 inches) and many more (IMG:style_emoticons/default/smile.gif)